Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis

Abstract

The superconducting (SC) phase diagram in uranium ditelluride is explored under magnetic fields ($H$) along the hard magnetic b-axis using a high-quality single crystal with $T_{\mathrm{c}}=2.1$ K. Simultaneous electrical resistivity and AC magnetic susceptibility measurements discern low- and high-field SC (LFSC and HFSC, respectively) phases with contrasting field-angular dependence. Crystal quality increases the upper critical field of the LFSC phase, but the $H^{\ast }$ of $\sim$15 T, at which the HFSC phase appears, is always the same through the various crystals. A phase boundary signature is also observed inside the LFSC phase near $H^{\ast }$, indicating an intermediate SC phase characterized by small flux pinning forces.

8 pages, 10 figures (including the Supplementary Materials, revision 2)

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• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Decoupling multi-phase superconductivity from normal state ordering in CeRh${}_2$As${}_2$
• Quantum-geometry-induced anapole superconductivity
• Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe${}_2$
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Piezoelectric effect and diode effect in anapole and monopole superconductors
• Anomalous vortex dynamics in spin-triplet superconductor UTe${}_2$
• Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh${}_2$As${}_2$ revealed by $\mu$SR studies
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• Clear Reduction in Spin Susceptibility and Superconducting Spin Rotation for $H\parallel a$ in the Early-Stage Sample of Spin-Triplet Superconductor UTe${}_2$
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in UTe${}_2$
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
• Observation of Persistent Zero Modes and Superconducting Vortex Doublets in UTe${}_2$
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• Self-reconstruction of order parameter in spin-triplet superconductor UTe${}_2$
• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Theoretical Study of Impurity Effects on Superconductivity in UTe2
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T
• Spin-lattice relaxation for point-node-like s-wave superconductivity in f-electron systems